Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)

Glow (MIR27.JRG)
By Jeff R. Graham
Copyright 2004
91.5% Light Return
Angles for R.I. = 1.62
46 facets + 5 facets on girdle = 51
5-fold, mirror-image symmetry
80 index
L/W = 1.051 T/W = 0.172 T/L = 0.164
P/W = 0.382 C/W = 0.246
H/W = (P+C)/W+0.02 = 0.648
P/H = 0.589 C/H = 0.380
Vol./W^3 = 0.196

Addition # 9 - This is designed for lightly saturated materials like Tourmaline and Aquamarine. Try this in a light Tourmaline nodule, it is a real sparkler. Cut in refractive indexes 1.54 to 2.14 with no changes. The table can be skipped on a small stone.

 

 

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